Regensburg 2004 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 5: Transporteigenschaften

HL 5.9: Vortrag

Montag, 8. März 2004, 12:15–12:30, H14

Preparation of curved two dimensional electron systems in InGaAs-microtubes — •Stefan Mendach, Olrik Schumacher, Christian Heyn, Holger Welsch, and Wolfgang Hansen — Institut für Angewandte Physik, Universität Hamburg, Jungiusstrasse 11, D-20355 Hamburg, Germany

We present a preparation method to realise transport measurements on evenly curved two-dimensional electron systems (2 DESs). By combining the method of self-rolling strained double-layers [1,2] with a special lithographic procedure we are able to roll-in and contact AlGaAs/GaAs/AlGaAs quantum well structures into tubes or curved lamellas, respectively. Applying a magnetic field to such structures results in a strong modulation with changing sign of the magnetic field components perpendicular to the curved 2 DES plane. Our preparation method allows transport measurements along or perpendicular to this modulation. We present and discuss our first magneto-transport measurements on such rolled 2 DESs.

[1] V. Ya. Prinz et al., Physica E6 (2000) 828-831.

[2] O.G. Schmidt, K. Eberl, Nature 410 (2001) 168.